Yarn twisting apparatus



W. POOh YARN TWISTING APPARATUS Filed Au s, 19s4 Nov. 5, 1935.

emug Patented Nov. 5, 1935 UNITED STATES YARN 'rwrs'rmo APPARATUS William Pool,- Spondon, near Derby, England, assignor to Oelanese Corporation of America, a corporation of Delaware Application August 3, 1934, Serial No. 738,188

' In Great Britain August 18, 1933 I Claims.

' ification is of the ,double twist" type. and comprises a pair of interconnected friction rollers adapted to be carried round by a member rotating the twisting spindle and to contact respectively with an annular race connected to the yarn package and an annular race independent of the package. The arrangement affords a simple and effective means for gearing the yarn package to a member independent of the means by which twist-applying rotation is imparted to the device, notwithstandingv thepackage having to be supported within the balloon of yarn which rotates completely round the package for the purpose of impai ting the double twist. In the prior specification the friction rollers are described as being loosely mounted on their pivot so that they are pressed outwardly by centrifugal force and caused to bear firmly against the two annular races.

In one of its aspects the present invention consists in an improved mounting for the friction rollers in order to take full advantage of centrifugal force in obtaining firm driving contact.

According to the invention the friction rollers are recessed at the two ends of their axes to receive a pair of balls which engage grooves in the member by which the rollers are carried bodily round the axis of the device. the grooves permitting the balls and therefore the rollers to move outwards under centrifugal force. Most conveniently radial grooves are employed which confine the balls in a circumferential direction, but permit them to move radially. The arrangement provides a ball-bearing mounting for the friction rollers, thus permitting them to be accurately positioned while very freely rotatable, and at the same time provides for the free outward movement of the rollers under the centrifugal force set up by the rotation of the member carrying the rollers.

A further important feature of the invention is that the friction rollers are of quite small diametcr with consequent reduction in the internal diameter of the annular races, thus permitting greater compactness of the apparatus and the possibility of higher speeds of operation. The friction rollers, in fact, may actually take the form of a single cylindrical roller having a diameter not greatly differing from that of the balls by which it is supported in position. The roller may be made of metal and so capable of being very accurately dimensioned, and] annular races engaging with such roller being also of accurate dimensions, the holding of the package substantially stationary within the balloon can beread- 5 fly accomplished. 'Moreover, the friction rollers may be hardened so that very little wear occurs in operation, with consequent accurate working of the device over long periods.

Any desired numberof friction rollers may be employed, but in general two rollers arranged at diametrically opposed points are sufiicient to transmit a firm, substantially vibrationlessdrive.

By way of example, one form of apparatus according to the invention will now' be described 1 in detail with reference to the accompanying drawing in which:-,-

Fig. 1 is a part sectional elevation of the apparatus on the line I--l of Fig. 2.

Fig. 2 is a plan view in section along the line 2-2 of Fig. 1, partly broken away at-the level 2.

Fig. 3 is a sectional view of part of the apparatus shown in Fig. 1; and

Fig. 4 is a part sectional side elevation of Fig. 1.

A yarn package 5 is mounted on a platform 6 carried by a cylindrical member I. The member '1 surrounds a hollow spindle 8, ball-bearings 9, I0 being provided between the member 1 and the spindle 8. The spindle 8 is rotated by means of a wharl ll carried by a bolster rail l2 and is provided with a disc-like member l3 round which is mounted a shield 14 extending upwardly and surrounding the base of bobbin 5. The spindle 8 is hollow and a horizontal passage I5 leads outwardly from its interior through the member IS.

A ring I6 mounted on the bolster rail I2 carries an upstanding race I1 and a similar depending race l8 of precisely the same diameter is carried (.0 by the cylindrical member I. Thetwo races i1,

iii are engaged by a friction roller l9 mounted in a recess 20 (Fig. 2) in the member l3. Rocesses 2| in the top and bottom of the roller 19 carry ball-bearings 22 which engage in radial V-shaped grooves 23 in the top and bottom of the recess 20 in the member I 3. The ball bearings and the radial grooves are shown in Figs.

3 and 4. Two rollers I9 are provided and are disposed diametrically opposite in the member I3, being engaged by appropriately disposed balls 22 as shown in Fig. 3.

When the spindle 8 is rotated by means of the wharl I l, the friction rollers l9 fly outwardly and are pressed by centrifugal force against the two eflectively geared together by the frictional engagement of the rollers I 9, and although the rollers l9 rotate bodily with the spindle 8, the race I8 is caused to remain stationary with the fixed race H. In consequence, the cylindrical member 1, platform 6 and bobbin 5 are kept stationary.

The yarn 25 drawn from the bobbin 5 is conducted over a brass cap 26 on the top of the bobbin 5 through a guide eye 21 mounted on the end of a spiral spring. 28, then outwardly over the edge of a disc 29. The yarn 25 then passes down a tube 30, which is plugged into the top of the bobbin 5 and carries the disc 29 and the spiral spring 28. The tube 30 extends to the bottom of the bobbin 5 where it meets a tube 3| screwed inside the spindle 8. The yarn passes down tubes 30 and 3| and out through the passage l5 from which it proceeds in the form of a balloon 32 to a guide eye 33 on the axis of the device. The rotation of the spindle 8 and of the member I 3 containing the passage l5 causes the balloon 32 to rotate round the stationary package 5 on which the yarn is drawn and, in consequence two turns of twist are imparted to the yarn for each revolution of the spindle 8.

By reason of this frictionless mounting on the balls 22 in the radial grooves 23, the friction rollers I!) may be permitted to rotate at a very high speed, and in consequence may be made of small diameter. This enables the diameter of the device in the neighbourhood of the friction rollers l9 to be reduced within the limits of the diameter of the bobbin 5 and its protecting shield H. The races l'l, I8 being accurately ground to the same internal diameter and the rollers l9 being truly cylindrical, a firm connection is maintained between the races so as to keep the race l8 stationary. In order toreduce the weight of the device,

the several parts shown in the drawing may be made as die castings of light alloy adapted to be secured to one another.

What I claim and desire to secure by Letters Patent is:

1. In a device adapted to impart to yarn drawn from a stationary yarn package two turns of twist for each revolution of the device, a member adapted to carry a yarn package, an annular race attached to said member, a fixed annular race, a rotatable member provided with grooves, a friction roller having a recess at each end, a pair of balls engaging said recesses and said grooves so that said roller is caused to rotate bodily with said-rotatable member, said grooves being such as to allow the roller to fly outwards under centrifugal force and to engage with said package races l1, 8. Inconsequence, the two races are from a stationary yarn package two turns of twist for each revolution of the device, a member adapted to carry; yarn package, an annular race attached to said member, a fixed annular race, a rotatable member provided with grooves, afriction roller in the form of a cylinder of small diameter having a recess at each end a pair oi. balls engaging said recesses and said grooves so that said roller is caused to rotate bodily with said rotatable member, said grooves being such as to allow said roller to fly outwards under centrifugal force and to engage with .said annular races so as to keep said yarn package stationary.

3'. In a device adapted to impart to yam drawn from a stationary yarn package two turns of twist for each revolution of the device, a member adapted to carry a yarn package, an annular race attached to said member. a fixed annular race, a rotatable member provided with grooves, a hardened metal friction roller in the form of a cylinder of small diameter having a recess at each end, a pair of balls engaging said recesses and said grooves so that said roller caused to rotate bodily with said rotatable member, said grooves being ,such as to allow said roller to. fly outwards under centrifugal force and to engage with said annular races so as to keep said yarn package stationary.

4. In a device adapted to impart to yarn drawn from a stationary yarn package two turns of twist for each revolution of the device, a member adapted to carry a yarn package, an annular race attached to said member, a fixed annular race, a rotatable member provided with grooves, a pair of. friction rollers, each having a recess at each end, a pair of balls in connection with each roller engaging said recesses and said grooves so that said roller is caused to rotate bodily with said rotatable member, said grooves being such as to allow said roller to fly outwards under centrifugal forceand to engage with said annular races so as to keep saidyarn package stationary.

5. In a device adapted to impart to yarn drawn from a stationary yarn package two turns of twist for each revolution of the device, a member adapted to carry a yarn package, an annular race attached to said member, a flxed annular race, a rotatable member having at least one cylindrical recess provided with grooves, at least ,one friction roller having a recess at each end and adapted to be accommodated in said recess, a pair of balls in connection with such roller engaging said recesses and said grooves so that said roller is caused to rotate bodily with said rotatable member, said grooves being such as to allow said roller to fly outwards under centrifugal force and to'engage with said annular races so as to keep said yarn package stationary.

WILLIAM POOL. 

